| "use strict" |
| |
| const crypto = require('crypto') |
| , moduleRequire = require('eslint-module-utils/module-require').default |
| , hashObject = require('eslint-module-utils/hash').hashObject |
| |
| const cache = new Map() |
| |
| // must match ESLint default options or we'll miss the cache every time |
| const parserOptions = { |
| loc: true, |
| range: true, |
| raw: true, |
| tokens: true, |
| comment: true, |
| attachComment: true, |
| } |
| |
| exports.parse = function parse(content, options) { |
| options = Object.assign({}, options, parserOptions) |
| |
| if (!options.filePath) { |
| throw new Error("no file path provided!") |
| } |
| |
| const keyHash = crypto.createHash('sha256') |
| keyHash.update(content) |
| hashObject(options, keyHash) |
| |
| const key = keyHash.digest('hex') |
| |
| let ast = cache.get(key) |
| if (ast != null) return ast |
| |
| const realParser = moduleRequire(options.parser) |
| |
| ast = realParser.parse(content, options) |
| cache.set(key, ast) |
| |
| return ast |
| } |